Stage four takes place in a factory, with a hole in the ground leading to the interior. On the other side of this entrance is a piece of food.
Inside, Kirby will have to climb down a ladder, avoiding Gordos and a Sawyer at the bottom. Ahead are platforms Kirby can drop through by crouching on them, though he needs to avoid the rockets that are deploying under each platform. Next, Kirby needs to drop through more platforms, this time with Shotzos firing cannonballs. Crossing a conveyor belt with a Hack will lead Kirby to the next area.
In the second area, King Dedede will appear and give Kirby a ride. They need to run against a conveyor belt, smashing walls and enemies on the way. Getting hit by the giant Hammers will cause an instant-kill on King Dedede. At the end, King Dedede will throw Kirby into the next area.
The next area has several conveyor belts and valve pipes to traverse, along with Gordos and I3 that need to be avoided.
The next area has dropping ceilings, which can crush Kirby if he gets caught between them. To avoid getting crushed when trying to cross, Kirby needs to stand in openings where the ceilings cannot reach him. Shotzos are also found in this area.
The final area is an ascending platformer. On each floor is an approaching wall manned by giant robots, the wall being able to damage Kirby if it contacts him and instantly killing him if Kirby gets stuck between it and the wall at the end of the halls. In the final hall with the Mahalls, Kirby needs to stand on a platform while the two robots close him in to avoid getting hit. After fighting off some Zoos and going through the door, the level will end.